First of all, you will need an image editing software program, which will help you in creating your own WordPress wallpaper. If you are using Microsoft Windows operating system, then you will have Microsoft Paint installed by default. If you do not like the program, then you can choose any other image editing software program that you like.
Launch the program and create a new file, with the same template size as coincides with your monitor’s resolution. Usually, images with 1024 by 768 and 1680 by 1050 resolution look good on most of the monitors available.
Open your WordPress blog and right click on your logo. Click “Save Image As”, and a new window will appear on your screen, asking you about the location where you want the logo image to be saved on your computer. You can then repeat the same procedure with your blog’s background, and save it on your computer.
Open the background image and right click on it. Select “Copy”, and open the image editing software program. Right click and select “Paste”. You can also paste the image from the “Edit” drop down menu.
Adjust it according to the size you created in the second step. Now repeat the same process with the logo you saved on your computer, to import it in the image editing software. Adjust its position and make any further changes to the image file, as per your needs.
Once you are done, click “Save As” from the “File” menu, and specify the location where you want the new wallpaper file to be saved in your computer. Click “Save”.
Now locate the image file on your computer and right click on it. Double click on it to open it in image viewer. Right click on it and select “Set as Desktop Background”.